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Complex Filling Dynamics in Mesoporous Thin Films.

Magalí Mercuri1, Karina Pierpauli1, Martín G Bellino1

  • 1Departamento de Micro y Nanotecnología, Comisión Nacional de Energía Atómica , Avenida General Paz 1499, San Martín, B1650 Buenos Aires, Argentina.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 14, 2016
PubMed
Summary

Investigating nanofluidic systems reveals that fluid front dynamics are governed by infiltration and evaporation. A model explains water infiltration in mesoporous films, while oscillating behavior was observed in wormlike structures.

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Area of Science:

  • Nanofluidics
  • Physical Chemistry
  • Materials Science

Background:

  • Fluid dynamics in porous media are crucial for various applications.
  • Understanding the interplay of infiltration and evaporation is key in nanofluidic systems.
  • Mesoporous materials offer unique properties for fluid transport studies.

Purpose of the Study:

  • To investigate fluid-front dynamics in nanofluidic systems under coexisting infiltration and evaporation.
  • To analyze water infiltration in titania and silica mesoporous films.
  • To model and understand the observed filling dynamics.

Main Methods:

  • Experimental setup involving sessile drop deposition on mesoporous films.
  • Optical monitoring and time-resolved recording of fluid front advancement.
  • Development of a model combining Lucas-Washburn infiltration and surface evaporation.

Main Results:

  • Capillary infiltration in titania mesoporous films was arrested, forming a steady wetted annulus.
  • The derived model accurately describes infiltration dynamics and annulus width in different mesoporous morphologies.
  • An oscillating fluid front behavior was observed in wormlike mesoporous structures, deviating from a steady infiltration-evaporation balance.

Conclusions:

  • The study provides a model for infiltration-evaporation dynamics in mesoporous films.
  • Observed phenomena, including arrested infiltration and oscillating fronts, offer insights into complex nanofluidic behavior.
  • The findings suggest potential for novel applications exploiting these unusual fluid dynamics.